Bifalgorithm post · Brisk · Chapter 1

Why is faveSport not injective?

Why is faveSport not injective? (Brisk · Chapter 1) — "No, because Julie and Sam (and Chuck) all map to the same value (basketball). For a function to be injec…

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Determining whether the mapping is injective
An injective function has no two domain elements mapping to the same codomain element.
Julie, Sam, and Chuck are domain elements.
Julie, Sam, and Chuck all map to the same codomain value: basketball.
Therefore, the function is not injective.

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Why is faveSport not injective?

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"No, because Julie and Sam (and Chuck) all map to the same value (basketball). For a function to be injective, there must be no two do- main elements that map to the same codomain element."

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